Composite positive electrode material and preparation method thereof, positive plate and secondary battery

Composite positive electrode material and preparation method thereof, positive plate and secondary battery

The invention provides a composite positive electrode material and a preparation method thereof, a positive plate and a secondary battery, the composite positive electrode material comprises a first positive electrode active material, a second positive electrode active material and a third positive...

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Bibliographische Detailangaben
Hauptverfasser: GUO LIMIN, YANG ZHIWU, LIU WENYUAN, CHENG TIANZHI, LIU YULIN
Format: Patent
Sprache:chi ; eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRICITY
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Beschreibung
Zusammenfassung:The invention provides a composite positive electrode material and a preparation method thereof, a positive plate and a secondary battery, the composite positive electrode material comprises a first positive electrode active material, a second positive electrode active material and a third positive electrode active material, the first positive electrode active material is a P63mc crystal form positive electrode active material, the second positive electrode active material is an Fd3-m crystal form positive electrode active material, and the third positive electrode active material is a Pmnb crystal form positive electrode material; wherein the average particle size of the first positive electrode active material is R1, the average particle size of the second positive electrode active material is R2, and the average particle size of the third positive electrode active material is R3; and the following relational expressions are satisfied: R2/R1 < = 0.414, R3/R1 < = 0.225, and R3/R2 < = 0.543. The composite pos